How can I create a screen effect when speed exceeds a certain number?

Development Rendering
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Hi people, complete noob here so bare with…

As the title says I would like to create an effect around the edge of the camera when my character starts running faster than a certain value. If possible I would like to be able to import a custom overlay that fades in as the speed increases. This is all I have so far, and it doesn’t work…

Thanks.

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Post process material:

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Would love to see the results of this. I’m aiming to do something similar